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fixed unclear documentation and added safety recommendations #998

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fixed unclear documentation and added safety recommendations #998

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4 changes: 3 additions & 1 deletion README.md
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Expand Up @@ -66,11 +66,13 @@ The header can be customized via the `options.header` object.

Generated jwts will include an `iat` (issued at) claim by default unless `noTimestamp` is specified. If `iat` is inserted in the payload, it will be used instead of the real timestamp for calculating other things like `exp` given a timespan in `options.expiresIn`.

It is recommended to store the secret key in a .env file.

Synchronous Sign with default (HMAC SHA256)

```js
var jwt = require('jsonwebtoken');
var token = jwt.sign({ foo: 'bar' }, 'shhhhh');
var token = jwt.sign({ foo: 'bar' }, 'secretkey');
```

Synchronous Sign with RSA SHA256
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